Elementos del período 6
El período 6 es la fila larga con 32 elementos, incluidos los 15 lantánidos (del cerio al lutecio), el pesado gas noble radón, y oro, mercurio, platino y wolframio.
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| No. | Symbol | Elemento | Peso atómico (u) | Densidad (g/cm³) | Punto de fusion (°C) | Punto de ebullición (°C) | Electronegatividad | Descubridor |
|---|---|---|---|---|---|---|---|---|
| 55 | Cs | Cesio | 132.905 | 1.93 | 28.55 | 670.85 | 0.79 | 1860 |
| 56 | Ba | Bario | 137.328 | 3.51 | 726.85 | 1844.85 | 0.89 | 1772 |
| 57 | La | Lantano | 138.905 | 6.162 | 919.85 | 3463.85 | 1.1 | 1838 |
| 58 | Ce | Cerio | 140.116 | 6.77 | 794.85 | 3442.85 | 1.12 | 1803 |
| 59 | Pr | Praseodimio | 140.908 | 6.77 | 934.85 | 3129.85 | 1.13 | 1885 |
| 60 | Nd | Neodimio | 144.242 | 7.01 | 1023.85 | 3073.85 | 1.14 | 1885 |
| 61 | Pm | Prometio | 145 | 7.26 | 1041.85 | 2999.85 | 1.13 | 1945 |
| 62 | Sm | Samario | 150.362 | 7.52 | 1071.85 | 1899.85 | 1.17 | 1879 |
| 63 | Eu | Europio | 151.964 | 5.264 | 825.85 | 1528.85 | 1.2 | 1896 |
| 64 | Gd | Gadolinio | 157.253 | 7.9 | 1311.85 | 2999.85 | 1.2 | 1880 |
| 65 | Tb | Terbio | 158.925 | 8.23 | 1355.85 | 3122.85 | 1.1 | 1843 |
| 66 | Dy | Disprosio | 162.5 | 8.54 | 1406.85 | 2566.85 | 1.22 | 1886 |
| 67 | Ho | Holmio | 164.93 | 8.79 | 1460.85 | 2599.85 | 1.23 | 1878 |
| 68 | Er | Erbio | 167.259 | 9.066 | 1528.85 | 2867.85 | 1.24 | 1843 |
| 69 | Tm | Tulio | 168.934 | 9.32 | 1544.85 | 1949.85 | 1.25 | 1879 |
| 70 | Yb | Iterbio | 173.045 | 6.9 | 823.85 | 1195.85 | 1.1 | 1878 |
| 71 | Lu | Lutecio | 174.967 | 9.841 | 1651.85 | 3401.85 | 1.27 | 1907 |
| 72 | Hf | Hafnio | 178.492 | 13.31 | 2232.85 | 4602.85 | 1.3 | 1922 |
| 73 | Ta | Tántalo | 180.948 | 16.69 | 3016.85 | 5457.85 | 1.5 | 1802 |
| 74 | W | Tungsteno | 183.841 | 19.25 | 3421.85 | 5929.85 | 2.36 | 1783 |
| 75 | Re | Renio | 186.207 | 21.02 | 3185.85 | 5595.85 | 1.9 | 1925 |
| 76 | Os | Osmio | 190.233 | 22.59 | 3032.85 | 5011.85 | 2.2 | 1803 |
| 77 | Ir | Iridio | 192.217 | 22.56 | 2445.85 | 4129.85 | 2.2 | 1803 |
| 78 | Pt | Platino | 195.085 | 21.45 | 1768.25 | 3824.85 | 2.28 | 1735 |
| 79 | Au | Oro | 196.967 | 19.3 | 1064.18 | 2969.85 | 2.54 | 6000 BC |
| 80 | Hg | Mercurio | 200.592 | 13.534 | -38.829 | 356.73 | 2 | 1500 BC |
| 81 | Tl | Talio | 204.382 | 11.85 | 303.85 | 1472.85 | 1.62 | 1861 |
| 82 | Pb | Plomo | 207.21 | 11.34 | 327.46 | 1748.85 | 1.87 | 7000 BC |
| 83 | Bi | Bismuto | 208.98 | 9.78 | 271.55 | 1563.85 | 2.02 | 1753 |
| 84 | Po | Polonio | 209 | 9.196 | 253.85 | 961.85 | 2 | 1898 |
| 85 | At | Astato | 210 | 6.35 | 301.85 | 336.85 | 2.2 | 1940 |
| 86 | Rn | Radón | 222 | 9.73 | -71.15 | -61.65 | 2.2 | 1899 |